How to extract all keys / values from JSON, using Python - json

Question

I need to extract the "string-value" and "value" from the "contains" element in the following JSON snippet:
{
"pricing-model": {
"qualifier": {
"and": {
"all": {
"equals": {
"constant": {
"string-value": "AFN",
"data-type": "java.lang.String"
},
"value": "item.priceInfo.currencyCode"
},
"collection-name": "items",
"element-name": "item"
},
"or": {
"contains": [
{
"constant": {
"string-value": "AF",
"data-type": "java.lang.String"
},
"value": "locale.country"
},
{
"constant": {
"string-value": "IR",
"data-type": "java.lang.String"
},
"value": "locale.country"
}
]
}
}
}
}
My current approach is too simple example below only extracts one string-value, when I need to extract both:
with open('my.json') as f:
data = json.load(f)
my_dict={}
for item in data:
value = item.get('pricing-model').get('qualifier').get('and').get('or')\
.get('constant')[0].get('string-value')

Answer 1

If you're unsure the keys exist, you can chain dict.get() with an empty dict as a default. That way .get() will always be a valid method of the result.
items = data.get('pricing-model', {}).get('qualifier', {}).get('and', {}).get('or', {}).get('contains', [])
values = [item.get('constant', {}).get('string-value') for item in items if item]
print(values) # ['AF', 'IR']
If you're certain that the keys will exist you can just access them directly as you would a standard dict.
items = data['pricing-model']['qualifier']['and']['or']['contains']
values = [item['constant']['string-value'] for item in items]
print(values)